fix (addon): #882 handle unload(reason="uninstall") (#884)
fix (addon): #882 handle unload(reason="uninstall") (#884)


Mardak/activity-stream,AdamHillier/activity-stream,AdamHillier/activity-stream,mozilla/activity-streams,JaredKerim-Mozilla/activity-stream,mozilla/activity-stream,rlr/activity-streams,sarracini/activity-stream,mozilla/activity-stream,dan-l/activity-stream,JaredKerim-Mozilla/activity-stream,mozilla/activity-stream,Mardak/activity-stream,AdamHillier/activity-stream,JaredKerim-Mozilla/activity-stream,dan-l/activity-stream,AdamHillier/activity-stream,rlr/activity-streams,mozilla/activity-streams,mozilla/activity-stream,Mardak/activity-stream,sarracini/activity-stream,rlr/activity-streams,sarracini/activity-stream,JaredKerim-Mozilla/activity-stream,Mardak/activity-stream,sarracini/activity-stream,rlr/activity-streams,dan-l/activity-stream